Consider moving libseccomp to LFS

[Bruce Dubbs]

This request came from Chase Knowlden on lfs-dev. I checked and file can use libseccomp, but how it is used is not obvious without digging into the code.

Moving a file from one book to the other is not trivial. Many packages have to be touched. Twelve BLFS packages mention libseccomp and in addition to adding the new page to LFS, at least five additional files need to be updated in LFS.

Note that libseccomp now lists three optional dependencies in BLFS and one external optional dependency,

The question is whether the benefit of moving the package is worth the effort.